Click Network in the third pane.
Network settings are displayed. Click Advanced.
Advanced Network settings are displayed. Click DNS tab on the top.
DNS Settings are displayed. Click '+' in the bottom left to add a DNS address.
Enter the value 220.127.116.11 under DNS Servers in the left box. This is an OpenDNS IP address. After entering this value, click the '+' sign again to add another OpenDNS IP address.
Enter the value 18.104.22.168 as the 2nd DNS Server. You can also use Google DNS IP addresses (22.214.171.124 or 126.96.36.199) instead of OpenDNS. Click OK.
Main Network settings are displayed again. Click Turn Wi-Fi Off button on top right.
A warning message is received. Click Apply.
The Wi-Fi gets turned off. Click Turn Wi-Fi On button on the top right to switch it on again.
Once Wi-Fi restarts, the button will start showing Turn Wi-Fi Off.